{"id":39694,"date":"2023-02-22T11:41:34","date_gmt":"2023-02-22T10:41:34","guid":{"rendered":"https:\/\/www.gt-engineering.it\/?post_type=approfondimento&#038;p=39694"},"modified":"2023-07-20T14:44:54","modified_gmt":"2023-07-20T13:44:54","slug":"la-difference-entre-les-dispositifs-a-courant-differentiel-residuel-a-haute-et-a-basse-sensibilite","status":"publish","type":"approfondimento","link":"https:\/\/www.gt-engineering.it\/fr\/approfondissement\/securite-electrique\/la-difference-entre-les-dispositifs-a-courant-differentiel-residuel-a-haute-et-a-basse-sensibilite\/","title":{"rendered":"La diff\u00e9rence entre les dispositifs \u00e0 courant diff\u00e9rentiel r\u00e9siduel \u00e0 haute et \u00e0 basse sensibilit\u00e9"},"content":{"rendered":"\n\n    \n        <section\n            data-name=\"Contenuto testuale con immagine\"\n            class=\"bow-gte-testo-media u-spacer-base\"\n            id=\"\"\n        >\n            \n<div class=\"o-text-media px-side-spacer sm:px-side-spacer-sm lg:px-side-spacer-tablet 2xl:px-side-spacer-desktop flex flex-wrap items-start flex-col\">\n\n    \n\n                    <div \n                class=\"order-2 relative w-full\"\n            >\n                <div\n                    class=\"pt-6 space-y-6 w-full md:pt-0 md:space-y-4 lg:space-y-8 xl:space-y-9\"\n                >\n                    \n<div class=\"a-text font-text text-base normal mt-8 first:mt-0 space-y-4\">\n    <p><strong>LA QUESTION :<\/strong><\/p>\n<p>Nous savons que les dispositifs \u00e0 courant diff\u00e9rentiel r\u00e9siduel (DDR) \u00e0 haute et \u00e0 basse sensibilit\u00e9 sont divis\u00e9s en fonction du courant I\u0394n (courant diff\u00e9rentiel nominal d&rsquo;intervention) qui d\u00e9clenche la protection, respectivement \u226430 mA pour les premiers et &gt;30mA pour les seconds. Mais est-ce vraiment la seule diff\u00e9rence ?<\/p>\n<p>&nbsp;<\/p>\n<p><strong>CONSID\u00c9RATION :<\/strong><\/p>\n<p><strong>Les dispositifs \u00e0 courant r\u00e9siduel contr\u00f4lent physiquement la somme vectorielle des courants de phase et du neutre<\/strong>, en v\u00e9rifiant qu&rsquo;elle est nulle, comme elle devrait l&rsquo;\u00eatre dans un circuit fonctionnant correctement ;<strong> lorsque cette somme d\u00e9passe la valeur seuil I\u0394n de la protection, l&rsquo;interrupteur d\u00e9clenche la protection, et le circuit est ouvert<\/strong>. D&rsquo;un point de vue th\u00e9orique, en effet, une somme diff\u00e9rente de z\u00e9ro implique un d\u00e9faut \u00e0 la terre, avec un courant relatif qui g\u00e9n\u00e8re le d\u00e9s\u00e9quilibre d\u00e9tect\u00e9 par la protection.<\/p>\n<p>Dans l&rsquo;image ci-dessous, vous pouvez voir un moteur \u00e9lectrique mis \u00e0 la terre dans un syst\u00e8me TN et prot\u00e9g\u00e9 par un RCD.<\/p>\n<\/div>                <\/div>\n            <\/div>\n        \n                    <div\n                class=\"h-auto order-2   mt-6 md:mt-4 lg:mt-8 xl:mt-9 overflow-hidden shadow-content-image w-full md:w-1\/3\"\n            >\n                \r\n\r\n    \r\n        \r\n            \r\n                \r\n                    <picture\r\n                        class=\"\"\r\n                                            >\r\n                                                                                                        <source\r\n                                media=\"(max-width: 150px)\"\r\n                                width=\"150\"\r\n                                height=\"150\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/07\/bs-eng.png-150x150.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 300px)\"\r\n                                width=\"300\"\r\n                                height=\"194\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/07\/bs-eng.png-300x194.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 661px)\"\r\n                                width=\"661\"\r\n                                height=\"428\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/07\/bs-eng.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 661px)\"\r\n                                width=\"661\"\r\n                                height=\"428\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/07\/bs-eng.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                            <img\r\n                            class=\"a-image transparent border-image h-auto  w-full mx-auto\"\r\n                                                        srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/07\/bs-eng.png.webp\"\r\n                                                        title=\"bs-eng.png\"\r\n                                                        type=\"image\/webp\"\r\n                        \/>\r\n                    <\/picture>\r\n\r\n                \r\n\r\n                    \r\n    \r\n            <\/div>\n        \n    <\/div>\n        <\/section>\n\n    \n\n\n\n\n    \n        <section\n            data-name=\"Contenuto testuale con immagine\"\n            class=\"bow-gte-testo-media u-spacer-base\"\n            id=\"\"\n        >\n            \n<div class=\"o-text-media px-side-spacer sm:px-side-spacer-sm lg:px-side-spacer-tablet 2xl:px-side-spacer-desktop flex flex-wrap items-start flex-col\">\n\n    \n\n                    <div \n                class=\"order-2 relative w-full\"\n            >\n                <div\n                    class=\"pt-6 space-y-6 w-full md:pt-0 md:space-y-4 lg:space-y-8 xl:space-y-9\"\n                >\n                    \n<div class=\"a-text font-text text-base normal mt-8 first:mt-0 space-y-4\">\n    <p>Dans cette configuration, la protection par contact indirect est assur\u00e9e par la mise \u00e0 la terre qui cr\u00e9e une boucle de d\u00e9faut et par le disjoncteur diff\u00e9rentiel :<\/p>\n<ul>\n<li>La mise \u00e0 la terre cr\u00e9e une boucle de d\u00e9faut dans laquelle le courant peut circuler en cas de d\u00e9faut \u00e0 la terre.<\/li>\n<li><strong>Le RCD d\u00e9tecte le courant dans la boucle de d\u00e9faut<\/strong> et ouvre le circuit instantan\u00e9ment afin de prot\u00e9ger la personne qui touche la masse en cas de d\u00e9faut de mise \u00e0 la terre.<\/li>\n<\/ul>\n<p><strong>Le point central est l&rsquo;action coordonn\u00e9e de la mise \u00e0 la terre et du RCD : sans mise \u00e0 la terre, le RCD \u00e0 faible sensibilit\u00e9 ne serait pas en mesure de d\u00e9tecter le d\u00e9faut de mise \u00e0 la terre<\/strong> et ne se d\u00e9clencherait pas en cas de contact indirect.<\/p>\n<p>&nbsp;<\/p>\n<p>Analysons donc un <strong>nouveau sc\u00e9nario<\/strong>, en plus du d\u00e9faut \u00e0 la terre, nous avons \u00e9galement un <strong>second d\u00e9faut : la mise \u00e0 la terre est d\u00e9connect\u00e9e et, pour cette raison, nous n&rsquo;avons pas de boucle de d\u00e9faut.<\/strong><\/p>\n<\/div>                <\/div>\n            <\/div>\n        \n                    <div\n                class=\"h-auto order-2   mt-6 md:mt-4 lg:mt-8 xl:mt-9 overflow-hidden shadow-content-image w-full md:w-1\/3\"\n            >\n                \r\n\r\n    \r\n        \r\n            \r\n                \r\n                    <picture\r\n                        class=\"\"\r\n                                            >\r\n                                                                                                        <source\r\n                                media=\"(max-width: 150px)\"\r\n                                width=\"150\"\r\n                                height=\"150\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/07\/hs-eng.png-150x150.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 300px)\"\r\n                                width=\"300\"\r\n                                height=\"188\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/07\/hs-eng.png-300x188.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 726px)\"\r\n                                width=\"726\"\r\n                                height=\"456\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/07\/hs-eng.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 726px)\"\r\n                                width=\"726\"\r\n                                height=\"456\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/07\/hs-eng.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                            <img\r\n                            class=\"a-image transparent border-image h-auto  w-full mx-auto\"\r\n                                                        srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/07\/hs-eng.png.webp\"\r\n                                                        title=\"hs-eng.png\"\r\n                                                        type=\"image\/webp\"\r\n                        \/>\r\n                    <\/picture>\r\n\r\n                \r\n\r\n                    \r\n    \r\n            <\/div>\n        \n    <\/div>\n        <\/section>\n\n    \n\n\n\n\n    \n        <section\n            data-name=\"Contenuto testuale con immagine\"\n            class=\"bow-gte-testo-media u-spacer-base\"\n            id=\"\"\n        >\n            \n<div class=\"o-text-media px-side-spacer sm:px-side-spacer-sm lg:px-side-spacer-tablet 2xl:px-side-spacer-desktop flex flex-wrap items-start md:block\">\n\n    \n        \n        \n                    <div class=\"relative w-full\">\n                \n<div class=\"a-text font-text text-base normal mt-8 first:mt-0 space-y-4\">\n    <p>Dans ce cas, comme nous l&rsquo;avons d\u00e9j\u00e0 expliqu\u00e9, un RCD ordinaire ne prot\u00e8ge pas contre l&rsquo;\u00e9lectrocution par contact indirect. C&rsquo;est dans ce sc\u00e9nario, avec<strong> une double d\u00e9faillance<\/strong>, que le disjoncteur diff\u00e9rentiel \u00e0 haute sensibilit\u00e9 trouve son utilit\u00e9. Il est capable de d\u00e9tecter m\u00eame le courant qui se d\u00e9charge par contact indirect, suffisamment \u00e9lev\u00e9 pour \u00eatre dangereux pour l&rsquo;homme, mais trop faible pour \u00eatre d\u00e9tect\u00e9 par un DDR ordinaire. <strong>Le DDR \u00e0 haute sensibilit\u00e9 est donc capable de sauver la personne m\u00eame en l&rsquo;absence de mise \u00e0 la terre et de boucle de d\u00e9faut.<\/strong> Pour la m\u00eame raison, le RCD \u00e0 haute sensibilit\u00e9 peut \u00eatre utilis\u00e9 comme protection suppl\u00e9mentaire pour le contact direct, par exemple en cas de dommages aux bo\u00eetiers ou \u00e0 la protection des conducteurs.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>CONCLUSION<\/strong><\/p>\n<p>Par cons\u00e9quent, m\u00eame si les disjoncteurs \u00e0 faible et \u00e0 haute sensibilit\u00e9 ont le m\u00eame principe de fonctionnement et ne diff\u00e8rent techniquement que par le courant diff\u00e9rentiel nominal d&rsquo;intervention, ils ont en pratique deux applications diff\u00e9rentes :<\/p>\n<ul>\n<li><strong>Le RCD \u00ab\u00a0sauve\u00a0\u00bb la vie humaine uniquement en pr\u00e9sence d&rsquo;une boucle de d\u00e9faut, avec des parties conductrices expos\u00e9es mises \u00e0 la terre.<\/strong> La m\u00eame fonction pourrait \u00eatre remplie, par exemple, par un disjoncteur.<\/li>\n<li><strong>Le disjoncteur diff\u00e9rentiel \u00e0 haute sensibilit\u00e9 fonctionne sur le d\u00e9faut de terre lorsqu&rsquo;il y a \u00e9galement un d\u00e9faut de mise \u00e0 la terre (deuxi\u00e8me d\u00e9faut),<\/strong> parvenant ainsi \u00e0 se pr\u00e9munir<strong> lui-m\u00eame<\/strong> contre l&rsquo;\u00e9lectrocution.<\/li>\n<\/ul>\n<\/div>            <\/div>\n        \n        \n                <div class=\"clear-both\"><\/div>\n        \n\n    <\/div>\n        <\/section>\n\n    \n","protected":false},"excerpt":{"rendered":"<p>Nous savons que les dispositifs \u00e0 courant diff\u00e9rentiel r\u00e9siduel (DDR) \u00e0 haute et \u00e0 basse sensibilit\u00e9 sont divis\u00e9s en fonction du courant I\u0394n (courant diff\u00e9rentiel nominal d&rsquo;intervention) qui d\u00e9clenche la protection, respectivement \u226430 mA pour les premiers et >30mA pour les seconds. Mais est-ce vraiment la seule diff\u00e9rence ?<\/p>\n","protected":false},"author":182,"featured_media":39695,"parent":0,"menu_order":125,"template":"","meta":{"_acf_changed":false,"footnotes":""},"tipologia_approfondimento":[158],"class_list":["post-39694","approfondimento","type-approfondimento","status-publish","has-post-thumbnail","hentry","tipologia_approfondimento-securite-electrique"],"acf":{"sottotitolo":"","allegati":null},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>La diff\u00e9rence entre les dispositifs \u00e0 courant diff\u00e9rentiel r\u00e9siduel \u00e0 haute et \u00e0 basse sensibilit\u00e9 - Gt-Engineering<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.gt-engineering.it\/fr\/approfondissement\/securite-electrique\/la-difference-entre-les-dispositifs-a-courant-differentiel-residuel-a-haute-et-a-basse-sensibilite\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La diff\u00e9rence entre les dispositifs \u00e0 courant diff\u00e9rentiel r\u00e9siduel \u00e0 haute et \u00e0 basse sensibilit\u00e9 - Gt-Engineering\" \/>\n<meta property=\"og:description\" content=\"Nous savons que les dispositifs \u00e0 courant diff\u00e9rentiel r\u00e9siduel (DDR) \u00e0 haute et \u00e0 basse sensibilit\u00e9 sont divis\u00e9s en fonction du courant I\u0394n (courant diff\u00e9rentiel nominal d&#039;intervention) qui d\u00e9clenche la protection, respectivement \u226430 mA pour les premiers et &gt;30mA pour les seconds. 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Mais est-ce vraiment la seule diff\u00e9rence ?","og_url":"https:\/\/www.gt-engineering.it\/fr\/approfondissement\/securite-electrique\/la-difference-entre-les-dispositifs-a-courant-differentiel-residuel-a-haute-et-a-basse-sensibilite\/","og_site_name":"Gt-Engineering","article_modified_time":"2023-07-20T13:44:54+00:00","og_image":[{"width":400,"height":400,"url":"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/07\/immagine-copertin1.jpeg.webp","type":"image\/webp"}],"twitter_card":"summary_large_image","schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.gt-engineering.it\/fr\/approfondissement\/securite-electrique\/la-difference-entre-les-dispositifs-a-courant-differentiel-residuel-a-haute-et-a-basse-sensibilite\/","url":"https:\/\/www.gt-engineering.it\/fr\/approfondissement\/securite-electrique\/la-difference-entre-les-dispositifs-a-courant-differentiel-residuel-a-haute-et-a-basse-sensibilite\/","name":"La diff\u00e9rence entre les dispositifs \u00e0 courant diff\u00e9rentiel r\u00e9siduel \u00e0 haute et \u00e0 basse sensibilit\u00e9 - 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